[Tutor] round() errors

[Kalle Svensson]

[Christian Mascher]
> I don't understand some response from the round()-function. 
> 
> >>> round(1.4783321399,2)
> 1.48
> >>> round(1.95583,2) # this is the ratio of EURO to DM
> 1.96
> 
> so far, so good, but ...
> 
> >>> round(10*1.95583,2) 
> 19.559999999999999
> >>> round(20*1.95583,2)
> 39.119999999999997
> >>> a=20*1.95583
> >>> a
> 39.116599999999998
> >>> round(a,2)
> 39.119999999999997
> 
> >>> print '%.2f' %a
> 39.12
> >>> 
> 
> why can't round() do the same? Is there any reason?

>>> round(20*1.95583,2)
39.119999999999997
>>> print round(20*1.95583,2)
39.12
>>> repr(round(20*1.95583,2))
'39.119999999999997'
>>> str(round(20*1.95583,2))
'39.12'
>>> 

Peace,
  Kalle
-- 
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